Infinite redirect loop on fresh installation of Grav

I'm a bit new to this, but I've followed instructions to the tee, and I just simply cannot get a grav install to work.

I have freshly installed PHP and Nginx on a fresh Ubuntu image. I've downloaded Grav and unzipped it to /var/www/html/grav

Navigating to localhost/grav gives me an infinite redirect!

Please help :(

What does your Nginx configuration look like?

user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
worker_connections 768;
}

http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
    ssl_prefer_server_ciphers on;

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    gzip on;
    gzip_disable "msie6";

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;

}

You seem to be missing the PHP section. You should look a the sample we include in the webserver-configs/ folder of Grav:

https://github.com/getgrav/grav/blob/develop/webserver-configs/nginx.conf